Highlighted hair which is then dyed will display different shades of color, but the process should not be affected otherwise. It is safe and easy to dye highlighted hair.
If dye and highlights are the same or similar colors, the finished dye job will manifest a gradient of similar shades. This can lead to highly desirable visual effects and can make experimenting with highlights worthwhile for real aficionados of hair coloration.
Multiple highlights of different colors can be used and dyed over to produce even more fantastic effects. Highlights also allow for a period of acclimation before a more extensive dying process is undertaken, letting the recipient become comfortable with the new color.